dovecot - Dec 2010 - Delay email!

I am using postfix + dovecot 2.0.6  + mailman

And others 2 serves with only postfix and dovecot writing at same storage
with OCFS2.

We are having problens with IOwait, and still trying to figure out why that
is happen!

But, problem becomes much worse when some emails are used in mailman, when
it happens all 3 serves became really slow. iowait goes to 80.

Does anyone have an idea how to slow down the dovecot lda ?

I want it to nit to iwrite so much email, at least take a small break
between each mail!!

Any ideias?

Thanks!



[]'sf.rique

On Thu, 2010-12-09 at 17:15 -0200, Henrique Fernandes
wrote:
> I am using postfix + dovecot 2.0.6  + mailman
> 
> And others 2 serves with only postfix and dovecot writing at same storage
> with OCFS2.
> 
> We are having problens with IOwait, and still trying to figure out why that
> is happen!
sdbox/mdbox format should reduce disk IO compared to maildir.
> But, problem becomes much worse when some emails are used in mailman, when
> it happens all 3 serves became really slow. iowait goes to 80.
> 
> Does anyone have an idea how to slow down the dovecot lda ?
By telling Postfix to limit the number of simultaneous dovecot-lda
processes. In master.cf you have:

# service type  private unpriv  chroot  wakeup  maxproc command + args

So change the dovecot-lda entry's maxproc from "-" to however many
simultaneous dovecot-ldas you want.